CCNP1-EIGRP基本配置

实验拓扑：

实验要求：1-R1与R2起EIGRP；

2-在R1上起Loopback，配置连续IP，观察EIGRP自动汇总，然后取消自动汇总，配置手动汇总，观察与自动汇总的区别；

3-在R2上配置到R3上的静态路由，并使用缺省路由通告给R1，观察R1与R2的路由表变化；

试验目的：掌握EIGRP的基本配置。

试验配置：

R1：

R1(config)#int s1/0

R1(config-if)#ip add 10.1.1.1 255.255.255.0

R1(config-if)#no shu

R1(config-if)#exit

R1(config)#int loop0

R1(config-if)#ip add 199.99.1.1 255.255.255.0

R1(config-if)#exit

R1(config)#router eigrp 100

R1(config-router)#net 10.0.0.0

R1(config-router)#net 199.99.1.0

R2：

R2(config)#int s1/0

R2(config-if)#ip add 10.1.1.2 255.255.255.0

R2(config-if)#clock rate 64000

R2(config-if)#no shu

R2(config-if)#exit

R2(config)#int s1/1

R2(config-if)#ip add 172.16.0.2 255.255.255.0

R2(config-if)#clock rate 64000

R2(config-if)#no shu

R2(config-if)#exit

R2(config)#router eigrp 100

R2(config-router)#net 10.0.0.0

R2(config-router)#net 172.16.0.0

在R1与R2上show ip route察看路由表：

R1#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

D 172.16.0.0/16 [90/2681856] via 10.1.1.2, 00:00:07, Serial1/0

C 199.99.1.0/24 is directly connected, Loopback0

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.1.1.0/24 is directly connected, Serial1/0

D 10.0.0.0/8 is a summary, 00:00:12, Null0

R2#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks

C 172.16.0.0/24 is directly connected, Serial1/1

D 172.16.0.0/16 is a summary, 00:00:03, Null0

D 199.99.1.0/24 [90/2297856] via 10.1.1.1, 00:00:05, Serial1/0

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.1.1.0/24 is directly connected, Serial1/0

D 10.0.0.0/8 is a summary, 00:00:03, Null0

可以看到收到了EIGRP的路由，OK，下面我们来比较自动汇总和手动汇总的区别：在R1上起Loopback接口测试：

R1(config)#int loop1

R1(config-if)#ip add 144.44.0.1 255.255.255.0

R1(config-if)#int loop2

R1(config-if)#ip add 144.44.1.1 255.255.255.0

R1(config-if)#int loop3

R1(config-if)#ip add 144.44.2.1 255.255.255.0

R1(config-if)#int loop4

R1(config-if)#ip add 144.44.3.1 255.255.255.0

R1(config-if)#exit

R1(config)#router eigrp 100

R1(config-router)#network 144.44.0.0 0.0.0.255

R1(config-router)#network 144.44.1.0 0.0.0.255

R1(config-router)#network 144.44.2.0 0.0.0.255

R1(config-router)#network 144.44.3.0 0.0.0.255

好，然后我们在R2上show ip route查看路由表：

R2#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks

C 172.16.0.0/24 is directly connected, Serial1/1

D 172.16.0.0/16 is a summary, 00:00:40, Null0

D 144.44.0.0/16 [90/2297856] via 10.1.1.1, 00:00:04, Serial1/0

D 199.99.1.0/24 [90/2297856] via 10.1.1.1, 00:00:42, Serial1/0

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.1.1.0/24 is directly connected, Serial1/0

D 10.0.0.0/8 is a summary, 00:00:40, Null0

EIGRP自动汇总功能把144的路由自动汇总成一个B类网络，下面我们取消自动汇总：

R1(config-router)#no auto-summary

到R2上察看路由表，观察有什么变化？

R2#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks

C 172.16.0.0/24 is directly connected, Serial1/1

D 172.16.0.0/16 is a summary, 00:00:43, Null0

144.44.0.0/24 is subnetted, 4 subnets

D 144.44.0.0 [90/2297856] via 10.1.1.1, 00:00:00, Serial1/0

D 144.44.1.0 [90/2297856] via 10.1.1.1, 00:00:00, Serial1/0

D 144.44.2.0 [90/2297856] via 10.1.1.1, 00:00:00, Serial1/0

D 144.44.3.0 [90/2297856] via 10.1.1.1, 00:00:00, Serial1/0

D 199.99.1.0/24 [90/2297856] via 10.1.1.1, 00:00:44, Serial1/0

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.1.1.0/24 is directly connected, Serial1/0

D 10.0.0.0/8 is a summary, 00:00:43, Null0

路由表中列出了4条到144网络的路由，下面再配置手动汇总，观察区别。

R1(config)#int s1/0

R1(config-if)#ip summary-address eigrp 100 144.44.0.0 255.255.252.0

再到R2上察看路由表，观察有什么变化？

R2#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks

C 172.16.0.0/24 is directly connected, Serial1/1

D 172.16.0.0/16 is a summary, 00:00:50, Null0

144.44.0.0/22 is subnetted, 1 subnets

D 144.44.0.0 [90/2297856] via 10.1.1.1, 00:00:00, Serial1/0

D 199.99.1.0/24 [90/2297856] via 10.1.1.1, 00:00:52, Serial1/0

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.1.1.0/24 is directly connected, Serial1/0

D 10.0.0.0/8 is a summary, 00:00:50, Null0

通告的掩码由原来自动汇总的16位，到没有汇总的24位，现在又到手动配置汇总的22位。这样可以大大减小路由标的大小，又可以配置一些不连续子网的汇聚（建议设计网络的时候都设计成连续的子网）。

路由器R3的配置如下：

R3(config)#int s1/0

R3(config-if)#ip add 172.16.0.1 255.255.255.0

R3(config-if)#no shu

R3(config-if)#exit

R3(config)#int loop0

R3(config-if)#ip add 172.16.1.1 255.255.255.0

R3(config-if)#int loop1

R3(config-if)#ip add 172.16.2.1 255.255.255.0

R3(config-if)#int loop2

R3(config-if)#ip add 172.16.3.1 255.255.255.0

R3(config-if)#exit

R3(config)#ip route 0.0.0.0 0.0.0.0 172.16.0.2

然后在R2上添加下面的两条命令：

R2(config)#ip default-network 172.16.0.0

R2(config)#ip route 172.16.0.0 255.255.0.0 172.16.0.1

然后在R2上show ip route察看路由表：

R2#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is 172.16.0.1 to network 172.16.0.0

* 172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks

C 172.16.0.0/24 is directly connected, Serial1/1

S* 172.16.0.0/16 [1/0] via 172.16.0.1

144.44.0.0/22 is subnetted, 1 subnets

D 144.44.0.0 [90/2297856] via 10.1.1.1, 00:01:08, Serial1/0

D 199.99.1.0/24 [90/2297856] via 10.1.1.1, 00:01:59, Serial1/0

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.1.1.0/24 is directly connected, Serial1/0

D 10.0.0.0/8 is a summary, 00:01:58, Null0

再到R1上察看一下路由表：

R1#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.1.1.2 to network 172.16.0.0

D* 172.16.0.0/16 [90/2681856] via 10.1.1.2, 00:00:04, Serial1/0

144.44.0.0/16 is variably subnetted, 5 subnets, 2 masks

C 144.44.0.0/24 is directly connected, Loopback1

D 144.44.0.0/22 is a summary, 00:01:07, Null0

C 144.44.1.0/24 is directly connected, Loopback2

C 144.44.2.0/24 is directly connected, Loopback3

C 144.44.3.0/24 is directly connected, Loopback4

C 199.99.1.0/24 is directly connected, Loopback0

10.0.0.0/24 is subnetted, 1 subnets

C 10.1.1.0 is directly connected, Serial1/0

看到了有个D*路由，说明R1通过R2学到一条到172.16.0.0/16的缺省路由，这样配置一般都是在EIGRP自治系统边界路由器上配置，为了向自治系统内通告一条缺省到自治系统外的路由。下面进行ping验证：

R1#ping 172.16.0.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.0.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 168/201/264 ms

R1#ping 172.16.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 168/239/288 ms

R1#

R1#ping 172.16.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.2.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 144/224/288 ms

都通了。

总结：通过实验掌握EIGRP基本配置，以及EIGRP自动汇聚与手动汇聚的区别，默认为自动汇聚，还掌握了ip default-network命令的用法和配置方法。

本文转自loveme2351CTO博客，原文链接： http://blog.51cto.com/loveme23/45310，如需转载请自行联系原作者

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